Wall assembly for new home near Vancouver Canada, and is GUTEX wood fiber insulation recognized as a WRB by code?
We’re finishing up the plans for a new home outside of Vancouver, Canada. My proposed exterior wall assembly is shown below. GUTEX wood fiber insulation serves as the WRB, interior plywood with taped seams serves as the air barrier, and vapour-retardant primer on the drywall serves as the vapour barrier. There would then by no poly or building wrap. I might be able to eliminate the service cavity for all walls with windows–to minimize window frame depth–as there are only ~3 outlets in total on such walls.
1. Is this extra insulation pointless, as my home has a lot of windows (see image here: https://www.greenbuildingadvisor.com/question/big-low-sloped-mono-pitched-roof-vented-or-unvented but note that the non-lake facing sides have much fewer windows)?
2. Is the GUTEX wood fiber insulation recognized by code as a weather-resistant barrier?
3. Is this a reasonable insulation plan for my region?
4. I know the GUTEX is expensive, but I’d rather pay more for materials and less in labor cost. This wall doesn’t seem _that_ much more complex to build than a conventional 2×6 wall. True or false?
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